I'm against it because "murder" has a lot to do with legal definitions.
It's not "murder" if the legal system declares that it's "lawful".
The executioner? Not a murderer, because the law says that what he does is okay.
Soldiers? Not murderers, because the law declares that what they do is okay. (Unfortunately, it can happen that your side loses, and the winning side has a completely different understanding about your actions being "lawful" or not)
Btw, I just realized for the first time that "lawful" and "awful" are just one letter apart.







